/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.ibm.bi.dml.runtime.util;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.SequenceFileRecordReader;

import com.ibm.bi.dml.runtime.matrix.data.MatrixBlock;
import com.ibm.bi.dml.runtime.matrix.data.MatrixIndexes;

/**
 * Custom record reader for binary block. Currently its only purpose is to allow for
 * detailed profiling of overall read time (io, deserialize, decompress).
 * 
 * NOTE: not used by default.
 */
public class BinaryBlockRecordReader extends SequenceFileRecordReader<MatrixIndexes,MatrixBlock>
{
	//private long _time = 0;
	
	public BinaryBlockRecordReader(Configuration conf, FileSplit split)
		throws IOException 
	{
		super(conf, split);
		
	}
	
	@Override
	public synchronized boolean next(MatrixIndexes key, MatrixBlock value)
		throws IOException 
	{
		//long t0 = System.nanoTime();		
		boolean ret = super.next(key, value);		
		//long t1 = System.nanoTime();
		
		//_time+=(t1-t0);
		
		return ret;
	}

	@Override
	public synchronized void close() 
		throws IOException 
	{		
		//in milliseconds.
		//System.out.println(_time/1000000);
		super.close();
	}
}
